Air-cooled rabble-arm.



C. G. FISHER & H. H. ROUNTREY. AIR COOLED RABBLB ARM.

APPLIOATION rILBD 00T. 2s', 101s.

1 ,1 1 6,255. Patented Nov. 3, 1914.

2 BHEETSSHBET l.

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THE NORRIS PETERS C0, PMOTOLITNG.l WSHINGTNY D4 C C. C. FISHER & H. H. ROUNTREY.

AIR OOOLED BABBLB ARM. APPLIOATIN FILED 0011.28, 1913.

Patented Nov. 3, 1914.

2 SHEETS--SHEET 2.

ano/Luna @C2 Wwf. @Mgg/m@ CHARLES C: FISI-IER AND HUBERT I-I. ROUNTREY, OF SOUTH NORFQLK, VIRGINIA.

.AIRf-COOLED BABELE-ARM.

Specification of Letters Patent.

Patented Nov. 3, 1914.

Application led October 28, 1913. Serial No. 797,897.

T0 all whom it may concern Be 1t known that we, CHARLES C. FISI-mn `and HUBERT H. RoUN'rnnY, citizens of the provements in AirCooled Babble-Arms, of

which the following is a specification.

This invention has relation to air cooled rabble arms especially adapted to be used in ore roasting furnaces and it consists in the novel features hereinafter described and claimed.

An object of the invention is to provide a rabble arm adapted to be mounted upon a shaft journaled for rotation and which is intended to operate over the levels or floors `ofa furnace for the purpose of agitating the ore and passing the same from one level to the next adjacent level. The rabble arm is provided with an opening which traverses the length thereof and the said opening and the inner portion of the arm enters the interior lof the shaft which is hollow. Any suitable means may be provided for rotat ing the shaft and dampers are provided at the upper end of the shaft for controlling the draft through the same. Each rabble arm carries at its inner end a valve and each valve is connected with an operating means and all of the said operating means extend above the upper end of the shaft and may be manipulated from above the shaft to control the draft through each individual rabble arm or tocut off the passage of air through any or all of the rabble arms.

In the accompanying drawings :-Figure 1 is a vertical sectional view of a furnace showing the rabble arms applied. Fig. 2 is a side elevation of one of the arms. Fig. 3 is an under view of the same. Fig. 4 is a longitudinal sectional view of the same. Fig. 5 is an innerend View of the same. Fig. 6 is anouter end view of the same.

As illustrated in the accompanying drawing the furnace 1 is of the usuallVedge type and is provided with levels 2 arranged in tiers vertically above each other. A verti` cally disposed hollow shaft 3 is journaled for rotation at theV center of the furnace 1 and is provided at its lower end with a gear wheel 4 which meshes with gear wheel 5 mounted upon a shaft 6. Any suitable means may be `provided for rotating the shaft 6 and consequently it will be seen that as the said shaft 6 rotates rotary movement is transmitted through the mtermeshing gear wheels 4 and 5 to the shaft 8. The shaft 3 is provided at its` upper end with dampers 7 which are adapted to control the draft of air through the shaft.

`The shaft 3 is provided at intervals `and at the inner portions of the levels 2 with bush ings 8. The partitions between the levels f2 of the furnace are provided with openings `9 and these openings are in staggered relation with respect to each other so that the material on an upper level must be moved toward the outer portion thereof, `for `instance, when it may fall through the `,openlng upon the next level below and the arm or arms operating over the last mentioned level will work the material toward the inner edge of the same and the opening 9 provided at the floor of the last mentioned level.

The rabbles comprise arms 10 which are hollow. They are provided at their under sides with teeth 11 which move over the upper surfaces of the levels 2; These teeth 4are pitched at angles with relation `to the long dimensions of the arms in order that they may move the material over the upper surface of the levels in the manner above indicated. The inner ends of the arms 5 are snugly received in the bushings 8 and Wedges 12 are passed transversely through the inner end portions of the said arms and bear at their edges against the inner ends of the said bushings and securely hold the arms in place in the bushings.

Valves 13 are hingedly mounted at the inner ends of the arms 10 and are adapted to hang pendent and while in this position close the openings to the said arms. Rods la are `connected at their lower ends with the valves 13 and pass up through the upper end of the shaft 3. Chain sections 15 are connected with the upper ends of the rods 14; and are adapted to be passed over a support 16 which is carried at the upper end of the said shaft 3. Therefore it will be seen that by moving the chain sections 15 and rodslt longitudinally the valves 3 may be opened to any desired extent and consequently the passageway for the air through the rabble arms 10 may be increased or diminished.

If desired some of the valves may be permitted to remain in a closed position while the other valves may be partially or completely opened and the passage of air through each individual rabble arm may be M. La

regulated or adjusted independent of the quantity of air Which is permitted to pass through the other rabble arms.

The furnace 1 is providedV at its side and at the outer portion of each level 2 with a door 17 and in the event that it is desired to remove one or more of the rabble arms for repairs or other purposes the Wedges 12 may be removed from the inner ends of thearms y5 by inserting a hook or other implement l down into the shaft 3 through theopening lfor the dampers 7 and engaging the saine With the said Wedges. After this has been done the doors 17 are opened and the rabble arms may be Withdrawn from the bushings 8 and other arms may be replaced in their stead. rherefore it will be seen that repairs may be made to the rabble arms and the saine may be removed from the furnace Without necessitating anv operator to go into the interior of the shaft 3 to disconnect the yarm from the shaft.

llieffurnace 1 is of a conventional ltype and receives the vmaterial to be operated upon at its top and the said material ispassed down through the several levels of the furnace and is eventually discharged at the bottom thereof.

The air which is permitted toI pass 'l through the rabble arms not only cools the f arms but the air becomes superheated and when it is discharged into the material upon the levels 2 it is in condition to ignite and facilitate the process of roasting the mate claimed is 1. A hollow shaft,` a rabble arm passing through the side of the same and having an opening which traverses its length, a swinging valve located at the innerend of the arm` and Within the shaft and means for operating the valve extending beyond the end of the shaft for holding the valve open.

2. A hollow shaft, a rabble arm passing through the' side of the same and havingy an opening which traverses its length, a valve positioned at the inner end of the arm, a rod connected tothe valve. avchain section connected to the rod and a support mounted above the shaft With Which the said chain section may be connected.

lntestimony whereof We Ialiix our. signatures in presence of two Witnesses.

CHARLES C. FlSHER.

HUBERT ll. ROUNTREY.

Witnesses z F. L. PoR'rLoGK, J. B. MCCLOUD.

Copies of this patentmay be obtained. for live cents each., by addressing the' Commissioner `of Patents.

Washington, D. Si. 

